If the father is A positive and the mother is O positive, can they have an O negative baby?

I am confused about how that all works.

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Given the criteria, the baby must be A or O from these parents. The Rh factor is a separate matter that is genetically determined. As a parent with blue eyes can have a brown-eyed child, positive Rh factor parents may be masking an Rh negative factor.

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Answer by curtangel (138)

Yes, they can. O- genes are recessive, the father's genes could be AO+- and the mother's could be OO+-. If only recessive genes are passed the baby would be OO--.

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Answer by Angie83 (180)

It is possible for a couple to have a baby with O- blood if the father is A+ and the mother is O+. A is dominate, so the father could carry the recessive O blood type. Rh+ is dominate, so both parents could carry the recessive Rh-. Father would have to carry O and both would have to carry Rh-.

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Reply by shirleymac (2):
if the siblings 4 above them are all positive, what are the chances the child number 5 would get that Rh - factor and not those above them....also can those same parents have a AB - child? add a comment

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